THERMODYNAMIC APPROXIMATION OF FERMION GREEN'S FUNCTIONS BY A VARIATIONAL PRINCIPLE.

THERMODYNAMIC GREEN'S FUNCTION FOR HARTREE--FOCK HAMILTONIAN.

THE VARIATIONAL SOLUTION OF THE SCHROEDINGER EQUATION OF FINITE FERMION SYSTEMS

GREEN'S FUNCTIONS FOR THE BOSE SUPERFLUID AND THE RELATIONS BETWEEN KINETICAL COEFFICIENTS.

GREEN'S FUNCTIONS FOR QUANTUM FERMI SYSTEMS OF COLLIDING CHARGED PARTICLES.

VARIATIONAL PRINCIPLE FOR QUANTUM UNBOUNDED SPIN SYSTEMS

On a new variational principle for fermions